Moon Phase Calculator

Moon phases represent the visible variations in the Moon's illuminated surface as observed from Earth over a synodic month (averaging 29.53 days). These changes occur due to the shifting geometric angle between the Earth, the Moon, and the Sun. In astronomy, the lunar cycle is categorized into eight primary phases, progressing from the New Moon to the Full Moon and concluding with the Waning Crescent.

This Moon Phase Calculator determines the lunar phase for any specified date (past, present, or future). Utilizing astronomical algorithms, the tool calculates the Moon's age in days and its precise percentage of illumination. This utility is used by astronomy enthusiasts tracking celestial events, photographers planning nocturnal shoots, and researchers analyzing tidal cycles. This tool is free to use and requires no registration.